Significant Accounting Policies (Estimated Useful Lives Of Property And Equipment) (Details)	12 Months Ended
	Dec. 31, 2011 years
Aircraft And Related Rotable Parts [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life, minimum	27
Estimated Useful Life, maximum	30
Buildings [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life, minimum	25
Estimated Useful Life, maximum	45
Other Property And Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life, minimum	4
Estimated Useful Life, maximum	15
Computer Software [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life, average	5
Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Life, minimum	1
Estimated Useful Life, maximum	40